Wall extrusion



FIG. 1 is a fragmented front, top, left side perspective view of an extrusion embodying my design;

FIG. 2 is a top plan view thereof, the bottom plan view of the extrusion being a mirror image thereof;

FIG. 3 is a reduced fragmented rear elevational view thereof;

FIG. 4 is a reduced fragmented right side elevational view thereof;

FIG. 5 is a reduced fragmented left side elevational view thereof; and,

FIG. 6 is a reduced front elevational view thereof; it being understood that the extrusion has been broken along one end as an indication of indeterminate length. 

The ornamental design for a wall extrusion, as shown and described. 